A couple of small improvements to CraftOS

- Make window.reposition's argument validation a little more strict.
   Previously it would accept `window.reposition(x, y, width)` (no
   height argument), just not act upon it.
 - Use select instead of table.unpack within `pastebin run`.
 - Use `parallel.waitForAny` instead of `waitForAll` within the dance
   program.
 - Pipe the entire help file into `textutils.pagedPrint`, rather than
   doing it line by line.
 - Remove bytecode loading disabling from bios.lua. This never worked
   correctly, and serves little purpose as LuaJ is not vulnerable to
   such exploits.

src/main/resources/assets/computercraft/lua/bios.lua

@@ -18,9 +18,6 @@ if _VERSION == "Lua 5.1" then
         if env ~= nil and type( env) ~= "table" then
             error( "bad argument #4 (expected table, got " .. type( env ) .. ")", 2 ) 
         end
-        if mode ~= nil and mode ~= "t" then
-            error( "Binary chunk loading prohibited", 2 )
-        end
         local ok, p1, p2 = pcall( function()        
             if type(x) == "string" then
                 local result, err = nativeloadstring( x, name )